Windows 10 Mobile Configuration Update

You should get this automatically if you’re an Insider in the Fast ring. But if you don’t see it yet or want to get on top of the situation, you can grab it by heading to Settings > Update & Security > Phone Update. A restart is required to complete the Configuration Update, too.

Again, there are not new features in this update. However, it does provide “under-the-hood” changes to prepare your device running the Windows 10 Mobile Insider Preview for the next round of cumulative updates.